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He said: 'I'm not so worried with emails, it's supposedly that this ransomware actually drops a back door and we don't know yet if our fix kills the backdoor as well.'There is a possibility someone could just re-hack the systems.'Assuming the backdoor wasn't killed, any computer that was infected previously would then be re-infectable.'They could essentially scan the internet for the backdoor and access it and drop the ransomware.He continued:'Users would have to power up their systems tomorrow, not connected to the internet and then check them for the backdoor before connecting to the internet.'It would be pretty tricky, you would need custom tools to actually scan and remove the backdoor.'Malware Tech reckons he has prevented 200,000 computers across the globe from being infected.
But Britain's nuclear deterrent is protected from cyber attacks, Sir Michael Fallon has said.
The Government had set aside more than £1.9 billion to tackle cyber threats, of which some £50 million went to the NHS, after an official security review highlighted hacks as a major threat, he said.
Sir Michael told the BBC's Andrew Marr Show: 'We never comment on the different systems, obviously for reasons of security, that our submarines use but our Vanguard submarines I can absolutely assure you, are safe and operate in isolation when they are out on patrol, and I have complete confidence in our nuclear deterrent.'Pressed further, he said: 'I can assure you that the nuclear deterrent is fully protected.'Sir Michael said the NHS had been warned over cyber threats in the months before Friday's attack but every effort is going into protecting the NHS.
But now Malware Tech, the cyber expert who halted the first strain of the ransomware, has revealed exclusively to Mail Online that a new wave of chaos could begin across the globe if hackers have installed a back door.
The British cyber whiz was hailed an 'accidental hero' after he registered a domain name that unexpectedly stopped the spread of the virus, which exploits a vulnerability in Microsoft Windows software.